New branch for building with nmake.

This is a branch, coz it's still crap.
Bump experimental version number.
Allow the build scripts to build a configurable type, and make that type RelWithDebInfo.
Make python output stuff in the proper order.
No need to run cmake twice, the user gets warned if they screw up.
Cmake now puts the running of vstool into the make files for us, so no need to do it in python.
Remove excess output from the vs finding code, and move it up in the file.
Remove more excess vs finding output.
Revert part of an earlier commit, no need to treat nmake differently for this bit.
Do the right vs finding thing even if it's an nmake build.
Small clean ups.
Make nmake builds more like VS builds.

Still some tweaking to go, therefore, still some rough bits in this.
Ah, iss has different UUIDs for release and experimentals.
Merge branch 'nmake' into next

nmake builds seem stable now.